My fiance, who said that he had no experience in sex industry, is so incredibly skilled that I get skeptical of doubt.

Fumino is Yu's fiancee, the eldest son of sake brewery, which has been in business for 150 years. To marry a venerable family, you need to be recognized by a strict father... Fumi, who has a neat and angel-like smile, is truly her ideal wife... In fact, she had a different face called Karen-chan, the No. 1 legendary sex worker for three years in a row. A true figure that should never be revealed. He shows off his sense of chastity and teases him without having sex until he gets married... However, for many years, the strongest Karen-chan (Fumino) unconsciously activates an "amazing technique." Yu begins to doubt Fumi's. He then asks a detective to investigate his father, Mofumi's background... What will happen? ?